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Half an oval is called a semicircle. It's like an oval that got cut in half, so now it's just half the fun. But hey, at least it's still technically correct!
the formula for calculating the surface area of an oval is A = Pi * a * b where a & b are the semimajor(half the long) and semiminor(half the short) axes
An oval
The shape of a flattened circle is called an ellipse. The shape is similar to an oval and some may mistakenly call it an oval.
I would call them Sir, or Ma'am, unless I knew their name.